Improvement in hot-air furnaces



. 2 Sheets--Sheet1.

JAMES H. MEARNS.

Improvement in Hot Air Furnaces.

v Patented Ma chIQ, 1872.

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Improvement in Hot Air Furnaces.

No, 124,842, Patented March 19, 1872.

W'Zne we a gzzy ew/i'o 7 a'rnlvr JAMES H. MEARNS, OF PHILADELRHIA, PENNSYLVANIA, ASSIGNOR TO HIM- SELF, JOB BARTLETT, JOSEPH D. BARTLETT, CHARLES F. BARTLETT, AND J. G. BARTLETT, OF SAME PLACE.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 124,842, dated March 19, 1872.

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of this specification.

The nature of my invention consists in the construction and arrangement of a portable heater, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which-- Figure 1 is a perspective view of my heater. Fig. 2 is a plan-view; and Fig. 3, a longitudinal vertical section of the same.

My heater is made of heavy wrought iron, riveted together, one-half, A, forming the ashpit, and the other, B, the furnace, for the purpose of getting and securing a large radiating surface. On the inside of the ash-pit A are shelves or rests a a, secured to the ash-pit by means of rivets or bolts, for the purpose of supporting bricks, whereby a saving of a great amount of labor is obtained over the old plan a of bending or offsetting the iron. On the front of the heater is a bed-plate, (l, in which there are two openings, one on each side of the door D, with dampers b, forming a flue from the ash-pit to the top of the fire, for the purpose of carrying off the dust made in raking the fire. There are also two other openings in the center of the bed-plate. One of these is for the purpose of attaching a chain, d, to the grate f of the furnace to raise or lower the same without opening the lower door of the furnace. This chain is provided with a stopper, 0, which fits in the opening of the bed-plate to make it air-tight. The other opening is )10"l(16d. with aslide,h,with a lip running through and connecting with the draw-bar k, which, when drawn out, allows the grate to fall, and, when in, supports the grate to its proper position, and completely closes the opening in the bed-plate so as to make it air-tight. The two openings in the center of the bed-plate are surrounded and covered by a niche, H, coming out to the front of the heater, so as to give access for working the chain and slide. mouth-piece of the furnace connecting the fire with the upper door is provided with shields or protection plates m m, which have openings for the purpose of allowing the draught to operate on the flue through perforations, thus car ryin g the dust over the top of the fire, through the drums to the flue, and preventing the coal or fuel from filling up the dust-flue. It is not intended to carry the ashes to the top of the fire, but only the finer particles of dust that usually escape from the ash-pit when the lower door is opened for raking. These shields also protect the mouth or neck from burning out, which is very essential, practical experience having demonstrated that itis the top and sides, not the bottom, of the neck or mouthpieces that are liable to burn out, as the force of heat in its natural tendency is upward. The furnace is provided with a number of radiators or drums. The inlet is placed near the front end of the furnace, as shown at t, Fig. 3, the drum G running toward the back on an incline, connecting with a lower drum or radiator, G, which lies in a horizontal position, and the ends of which project through the casing provided with caps or doors a n, for the pur pose of cleaning out. On the horizontal drum or radiator G are placed two oval drums or radiators, G2 G connected at or near the'top, as shown. On the other end of said horizontal drum is placed another inclined drum, G connecting with gas-pipe or flue I. The bottomsof these drums or radiators are intended to be made of galvanized iron, to prevent rust and soot from eating the same.

The draught first rises from the fire to the top of the furnace; then it enters the inclined drum The neck or side casin g J be bowed or sprung, so as to form a flue between it and the outside casing, so as to allow cold air to pass between the two casings, thus preventing the radiation of heat to the cellar. The frame upon which the casings are placed is made of cast-iron and in sections, intended to be put together by bolts and rivets or their equivalents, having a bottom, middle, and top frame, with inside and outside upright pieces. They can be made in such a manner that the outside piece can be taken off and the iron placed against the inside, and the cap or outside upright put to its place, thus clamping the iron, making a substantial job. The top frame is made smaller than the other frames in order to secure a slant or pitch for the purpose of attaching hot-air pipes. On the top frame there is a flange, 10, extending upward, also a flange, p, extending in to support a sheet-iron top, which is intended to be filled with cement or sand, for the purpose of preventin gradiati on' of heat to the cellar. Through the top of the hot-air pipes s s there is a water-pipe, 2, running, with openings, so as to allow water to sprinkle the hot air as it passes from the furnace.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The bed-plate 0, provided with suitable openings, so as to work the draw-bar k and chain at from the top of or through the same, substantially as set forth.

2. Theperforated shields or protection-plates m m, arranged in the neck or mouth-piece of the furnace, substantially as and for the purposes herein set forth.

3. The arrangement of the drums or radiators G G G G, substantially as herein set forth.

In testimony that I claim the foregoing. as my own I affix my signature in presence of two witnesses.

JAMES H. MEARNS.

Witnesses:

T. H. ALEXANDER, JNo. A. ELLIs. 

